#include <stdio.h>
#include <ulib.h>

int
main(void) {
	int pid, exit_code;
	if ((pid = fork()) == 0) {
		cprintf("fork ok.\n");
		int i;
		for (i = 0; i < 10; i ++) {
			yield();
		}
		exit(0xbeaf);
	}
	assert(pid > 0);
	assert(waitpid(-1, NULL) != 0);
	assert(waitpid(pid, (void *)0xC0000000) != 0);
	assert(waitpid(pid, &exit_code) == 0 && exit_code == 0xbeaf);
	cprintf("badarg pass.\n");
	return 0;
}

